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A155419 Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,1 5,1 6,2 7,2 polyhexes in any orientation on a planar nXnXn triangular grid. 0
1, 7, 19, 52, 207, 826, 3466, 17019, 96663, 608856, 4591353, 39344454 (list; graph; refs; listen; history; text; internal format)
OFFSET

7,2

LINKS

Table of n, a(n) for n=7..18.

EXAMPLE

Maximal 11 X 11 X 11 example

.............1

............1.0

...........0.1.0

..........0.1.0.1

.........0.1.0.0.1

........0.1.0.0.1.0

.......0.0.1.0.0.1.0

......0.0.1.0.0.0.1.0

.....0.0.0.0.1.1.0.1.0

....0.1.1.1.1.0.0.1.0.0

...1.1.0.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A155385 A155345 A155309 * A155246 A155414 A155374

Adjacent sequences:  A155416 A155417 A155418 * A155420 A155421 A155422

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 22 2009

STATUS

approved

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Last modified September 17 16:57 EDT 2019. Contains 327136 sequences. (Running on oeis4.)